Count unique values in columns based on 2 criteria

I am trying to calculate the number of email addresses in an array that does not have a phone number associated with that email address address anywhere in the array. the formula i am trying to create would result in 3.

Cell B3

Here is the formula:
=SUM(IF(FREQUENCY(IF((A9:A29<>"")*(B9:B29=""), MATCH(A9:A29,A9:A29,0)),ROW(A9:A29)-MIN(ROW(A9:A29))+1),1))